Properties of the Number 6865

Six Thousand Eight Hundred Sixty-Five

Basics

Value: 6864 → 6865 → 6866

Parity: odd

Prime: No

Previous Prime: 6863

Next Prime: 6869

Digit Sum: 25

Digital Root: 7

Palindrome: No

Factorization: 5 × 1373

Divisors: 1, 5, 1373, 6865

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

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Representations

Binary: 1101011010001

Octal: 15321

Duodecimal: 3B81

Hexadecimal: 1ad1

Square: 47128225

Square Root: 82.85529554590944

Classification

Fibonacci: No

Bell Number: No

Factorial Number: No

Regular Number: No

Perfect Number: No

Special

Kaprekar Constant: No

Munchausen Constant: No

Armstrong Number: No

Kaprekar Number: No

Catalan Number: No

Vampire Number: No

Taxicab Number: No

Super Prime: No

Friedman Number: No

Fermat Number: No

Cullen Number: No

OEIS Sequences

Self-convolution of Fibonacci numbers. A1629

a(n) is the solution to the postage stamp problem with 5 denominations and n stamps. A1210

T(n,k)=Number of nXk binary arrays with some element plus some horizontally or antidiagonally adjacent neighbor totalling two exactly once. A268886

Number of 2 X 2 singular integer matrices with elements from {1,...,n}. A134506

Bisection of Fibonacci triangle A037027: even-indexed members of column sequences of A037027 (not counting leading zeros). A60920

Semiprimes in A056106. A113524

Same rule as Aitken triangle (A011971) except a(0,0)=1, a(1,0)=0. A46934

Centered 13-gonal numbers. A69126

Composite squarefree numbers n such that p + τ(n) divides n - φ(n), where p are the prime factors of n, τ(n) = A000005(n) and φ(n) = A000010(n). A229324

Even-indexed terms of A001629(n), n >= 2, (Fibonacci convolution). A54444